Fuel gas volume control for internal-combustion engines



Jan. 19, 1954 c. s. KENWORTHY ETAL FUEL GAS VOL IE GON'IKBL EURINTERNAL-QOMBUSTION ENGINES Filed Aug. 2. 1952 4 Sheets-Sheet l IN VENTORS CLARENCE S.KENWORTHY WILLIAM I BLES'SING Jan. 19, 1954 2,666,422

FUEL GAS vowuz common. FOR INTERNAL-COMBUSTION ENGINES .c. s. KENWORTHYEI'AL Filed Aug. 2, 1952 4 Sheets-Sheet 2 H I MH Wu W M 3 |l// m "a N I-1 H 0 [I u a //l\\\ Q.

FIG. 3

FIG.2

CLARENCE S.KENWORTHY WILLIAM I BLESFISWIEMQ;

Jan. 19,1954 c; s. KENWORIHY ETAL 2,

' FUEL" GAS VOLUME CONTROL FOR INTERNAL-COMBUSTION ENGINES Filed Aug. 2,1952 I 4 Sheets-Sheet 3 TO SCAVENG-ING- CLARENCE s. KENWORTHY WILLIAMIBLESSING IN VEN TORS Jan. 1954 c. s. KENWORTHY ETAL- 2,666,422

FUEL GAS VOLUME CONTROL FQB INTERNAL-COMBUSTION ENGINES Filed Aug. 21952 4 Sheets-Sheet 4 FIG. 6

PUSH BUTTON VALVE FOR STAR ING AlR t 5' I L W CLARENCE S.KENWORTHYWILLIAM J. BLESSING g; INVENTORS g BY Patented Jan. 19, 1954 1 FUEL-GA's v'o 'UME ammer, "FOR INTERNAL- COMBUS'IION IENGINES Ll'llarence S.Kenwofthy, Evanston, 111., "and 'iw liam ili Blessing, Buffalo, Y3sal'id Blessing ssigno'rto Worthington Corporation, Harrison, 37., a"corporation of Delaware :Apirlieation Aurust z, 195:2;Serial-Nm 302.5296

' (crime-no) T21 Claims.

This finrentionsrel tes to internal oombustion engines and more.particulai ly to spark i nition engines employ ng Igas. s xth as at rallees, snanuiaotured .gas, sewage i g eta, as, .fuel.

Thei'primany-obleet .iofthepresent invention is tonrovide meanstQ-oontrdljthefflow of iuelgas to the combustion chaniber of anengineingnro- ,nortionate volume to the sca en ing rail fl t theengineeomhustioni ohamher and to hold the ogaseair volumeratio, sonontrolle'd, within the roombustiblerange.

' The control of 'the fuelgas ,fiow to :the oom bustion ohamh r of theengine ffaoilitates starting or theengine'inthattit eliminates he necessity of graduallyincrea ine rthe gass p sp surerby slowly advancing thethrottle lever until the engine fires and -,also eliminates false startsof the engine due to excessive gaspressure resulting in an unb lancedas-air volum'e'ratio.

An object f the presentlinvent on is to provide a gas fuel volumekoontrol valve eonnected in the as fuel sunply line of'the engine, whichvolume control valve emhodies pressu e'atuated means for openin the-valve. The pressure ac tuated means aotuated.byithel ressure-of the vscavenging .air supplied 'to the engine lcombustion ehaznben pressure oflubricating oil, temperature, .ofjeooling water, eta, so that-thepositlve positioning of the as fuel volume control valve is inproportionto the soavengingiair pres lubrieating 'theeoolins'we en The volume ofair supplied to the engine'com. hustion chamber relative to the scavenin -air pres ure. and the' uel-gas volume is relative to the portopening in thelgasv lume control 'va'1ve,7and thus the volume of fuelgas delivered to the combllstion ohamber is proportionate to the volumeof ai supplied to the vomlrlloustion chamber of theengine. Y Anotherob'ieot of the present invention, i to Provide means. m the. gas volume,control valve, 16. ion when the valve closed and; the engine.

2 stop position and the ignition -.system is *de-en- Qfi26whiohpreventsIuel-gas from being supvpliedltothecombustion chambers ofthe engine iwhen imp qpel' tarting sequence is followed.

With theseand other objectstin view, as may alppearfrom'theao'companying specification, the

invention consists *of various features of conis'truction'andcombination of parts, which will be firstdescribedin connection with theaccompanying drawings, showingsa'ful gas Volume con trol 'foririternal"combustion engines of a pre ferredfofm'embodying the invention, and thei'features' forl'tiingthe invention will be specifically ll'ointel'dou'tinthe claims.

'Inthe drawings:

.Fi ure 1 is a diagrammatic'view-partl in secnon illustrat'ingthe fuelgas volume control.

Figure 2 "is an enlarged side elevation of the fuelg'asvolume'oo'ntrolvalve. I

"Figure'3 is a'verticalsection through the fuel gas 'volume controlvalve taken on the line 3- OffF gure-Z. I

Figure 4 isa detaili seotion through the throttle lever aotuated safety'lock-out Valve.

Figure 5 is a diagrammatic 'view of a modified form 02f the "fuel gasvolume control mechanism oil ipr'onureot temperature of oonseguenth! stpped, will bleed err. any residual Y ituel as which. m y hetrapp'edin'the fuel, gas manitolcl. and. engine fuel piping between the volumecontrol; valve and the combustion chamhen thus. preventing premature anddangerous e mlos ons when the engine'ls re -s arted.-

A iurther' obj eot the. .llresent invention is-to provide means whiohtueolude dangerous errors in en ine st rting operation sequencbyproviding automa ic loelsrout oi the fuel volume-eontrol val e When hemanually operated throttle lett r oi the engine-is or; is awa t irom theembodying means for 'eontrol ofvolume of fuel gas by pressuremeans'responsive 'to pressure of the scavenging air and closing gasvalve when low lubricating oilflp'ressure or high jacket watertemperature occurs.

Figure, 6 is a diagrammatic view showing the 'applieati'on of "themodification shown in Figure 5 "to the entire system and showing theappa ratus operated hybre'ssure of lubricating oil or jacket watertemperature enlarged in proportion to the remaining parts of the systemand showing parts of 's'uc hstr'uoture in section.

Referring 'pairtioularly to the-diagrammatic i1 lustrationin Figure 1 ofthe drawings, the spark gnition fuel gas internal combustion engine in!eludes a"c,ylinder I having combustion chamber 2 in "which the piston 3reciprooates. The cylindei' has a plurality of air inlet openings 4openin'ginto the combustion chamber through which scavenging air forcleaning or scavenging the cylinder enters the cylinder as well as theair which is used m oombination or mixed with fuel gas to-providecombustion in the combustion ohamber 2. IntheIor-m' of the engine showndiagrammat lly in the drawings the scavenging air is delivered to thescavenging air manifold 5 iron: any suitable source and from themanifold 5 to suitable piping 6 to the, ports 4. It is to be understood,*of course, that the present invenpressed by a compressor (not shown)operated by,

the engine.

The fuel is admitted to the combustion chamher 2 through the fuel gasinlet valve 8 as is usual in the construction of engines of this type.The fuel gas and the air mixture is fired in the combustion chamber,when compressed, by a suitable spark plug shown at 9. The pressure ofthe gas delivered to the engine is in ordinary construction of enginesof this type under control of a governor controlled gas metering valvestructure I5, construction of which valve forms no part of the presentinvention.

In the fuel gas volume control system forming the present invention afuel gas volume control valve structure I! is connected in the fuel gassupply line at any suitable point, preferably in advance of the governorcontrolled gas metering valve it but the invention is not so limited.The fuel gas volume control valve structure II is specificallyillustrated in Figures 2 and 3 of the drawings and it comprises thevalve housing I2 which has an outlet opening I3 and an inner valvehousing I4 the interior of which is connected through a port I5. Thefuel inlet port I5 is connected to the supply source of fuel gas (notshown) while the outlet opening I3 is connected to the pipe Is forsupplying fuel gas to the combustion chamber of the engine. The valvehousing !4 has an opening !I therein which establishes communicationbetween the interior of the housing I2 and the interior of the housingI4 so that when the opening or port I! is opened gas may flow throughthe volume control valve structure H. A valve I8 is carried by thehousing !4 for reciprocatory movement relative thereto and it has atapered end 19 which cooperates with the opening I! to vary or graduatethe cross sectional area of the open part of the opening I! so that thequantity or volume of gas permitted to flow through the volume controlvalve II is regulated by the position of the reciprocating valve I8 andwhen the reciprocating valve I8 is seated upon the valve seat 23 a fiowof fuel gas through the volume control valve is cut off. A valve stem 2!is connected to the reciprocating valve I B for moving this valve and ithas its end remote from the valve I8 connected to a diaphragm 22enclosed in a fluid tight housing 23. The fluid tight housing has aninlet 24 to permit the inlet of a pressure fluid into the housing 23 foracting against the diaphragm 22 to positively move the valve is in openposition in accordance with the degree of the pressure applied to thediaphragm 22 and thus the volume of fuel gas permitted to flow throughthe volume control structure H is regulated by the pressure exertedagainst the diaphragm 22 and consequently will. be in proportion to suchpressure.

A pivoted lever 25 is connected to the valve stem 2! as shown at 23 andit is pivotally sup ported by a suitable link 2! attached. to the housing 23. A spring 23 is connected to the lever 25 and the spring 23 istensioned and the lever 25 is positioned so that when the tension of thespring 28 exceeds the pressure applied to the diaphragm 22 the springwill seat the valve, 3

top of the valve through a reduced bore 3!.

on the valve seat 20 and cut off the flow of fuel gas through the valve.The usual construction of threaded rod and nut arrangement shown at 23is provided for adjusting the tension of the spring 28.

The reciprocating valve I8 is provided with an axial bore 30 which opensout through the A bleed-off control valve stem 32 is mounted forreciprocating movement in the bores 30 and 3|. The stem 32 has anenlarged head 33 engaging the shoulder 34 formed by the reduced bore 3!.A spring 35 is coiled in the bore 35 and engages the head 33 on the endof the stem 32 for urging the valve or closure element 36 which wasmounted on the outer or upper end of the stem 32, into engagement withthe seat 31. The seat 3! surrounds a bleed-off opening 38 which opensinto the interior of the housing I2 so that when the valve I8 is closedand the engine consequently is shut down the valve 36 will be moved offof its seat and any residual gas contained in the housing I2 and thepiping I3 will be bled to atmosphere thus relieving the engine piping ormanifold of trapped fuel gas which might cause dangerous explosions uponthe re-starting of the engine.

In the system shown in Figure 1 of the drawings scavenging air from thescavenging air supply manifold or piping 5 or 6 of the engine isdelivered to the interior of the housing 23 for action against thediaphragm 22 through a threevvay valve structure 40 by means of suitablepiping 4! in advance of the valve structure 40 and piping 42 between thevalve structure 43 and the pressure actuated diaphragm 22. The valvestructure 40 is a solenoid-held three-way valve of any approvedconstruction which may be purchased upon the open market, the operationof the valve being dependent upon operation of its solenoid 43 and alsoupon the safety reset feature provided through the medium of the lever44 which is connected to and operates the valve structure. The lever 44is connected through the medium of a connector 45 with its piston of anordinary pressure actuated piston and cylinder construction 46 so thatwhen pressure fluid is delivered to the cylinder and piston structure 46the lever 44 will be operated on its pivot 41 to operate the valve 40 toopen the valve to permit scavenging air to flow through the valve intothe housing 23 for action on the diaphragm 22.

Starting air pressure is employed in the present system for operatingthe cylinder and piston construction 45 and such starting air isdelivered to the cylinder and piston construction 45 through a three-wayvalve 48. The valve 48 is carried by the housing of the throttlestructure 49 which includes the manually operated throttle lever 50.

The valve structure 48 includes a housing 5i in which a plunger valve 52reciprocates for making or breaking communication between the pressureair inlet port 53 to the cylinder 5| and the pressure outlet port 54 ofthe cylinder. The plunger valve 52 is urged into position to cut offcommunication between the ports 53 and 55 by means of a spring 55 andwhen communication between the ports 53 and 54 is cut off air is bledfrom the cylinder 46 back through the port 54 and out through thebleed-off port 55 in thecylinder 5!. The endoi the plunger valve 52remote from the end engaged by the spring 55 projects out of thecylinder 5! and is engaged by a pivoted lever 51 which is positioned inthe fashion: at; the. throttla levee: 5.3) soathnt when: thethrettleleror .501 mnvect to st m BQSitioH: the lever 51 will beoperated to open: the'ports; d; 54; tocommunication-with; eac o h e et:po t 5%. of the: v lve structure 44tis connected; through suitablepiper- 58; with tha l e 59 which delivers starting air to the: eng ne 01r inders and the outlet; port 54-. isgoonnc tod to: cylinder 4.6;through suitable piping 5.0a-

Flow of: starting"; air tc the engine; controlled; y the; usu l ype f:manually op ra e push button switch to]; which is; an ordinary constr:tion" usually employed} engines; of: this; type: for controlling the;flow 02 the startin 13.0? an engine; The: oloctrlocal; circuit. th ou hspark" plu 9 and. also; throueh; the-so enoid 4.3.-

- t th solenoid actuated valvestruotur dlts controlled: by a manually:operated: hush. ton switch structure 62- of the; usual ordina y constructi n employ d: for this purp se-- The: push button switchstructure- M is. indioa$6d as car, riedaby thehousing 49. of thethrottle structure;

Uponstarting an engine; the push button; switch at is operatedtoadmitstarting; air to, th yl d s of the in and at such time. the?throttle lever; 5&- is in the stop position having actuatedthe lever51'- to operate thefvalve plunger 52 to establish communication betweenthe: ports 53- and- 54, Thus when starting air is admitted to thecylinders or the engine apart ofthe; start. ing air will now throughthe. valve: structure t8 to the cylinder-and piston structure 46; andmove the, piston thereot and; the, lever- AA- into: the; upper dottedlineposition shownin Figure L. This operation will open the valve- 4IL.The operationof the ensinehy the starting air willbuild' up somepressure of scavenging air which is delivered to thecombustion chamber 2undercontrol of the piston 3' as it reciprocates and some of thisscavenginaai-r will flow throughv the,- valve 40 into the housing inlet24 and: act uponthe di-aphragm 2,2- moving the, diaphragm andconsequently the valve, t8 to open theport U in increments correspondingto the degree; of pres sure of the scavenging air thus permitting fuelgas in proportion to the pressure 0; the scavenge ingair to be deliveredto the combusticn cham, bers of the engine through the governor actuatedmetering valve structure In permitting a proper combustible. mixtureof air and fuel gas to be delivered to the com ust o ohamhor so asv toprovideproper ignition thereof when the push button switch 62 isoperated tdturn on the ignition system. As the: engine starts and iscontinued in operation b3? the explosion of. the 5 gas in the combustionchamber the pressure of the scavenging air increases and the valve L8is, in consequence thereof, opened greater distances still in proportionto the pressure of. the scavenging air,- When the throttle lever 5a ismoved from the stop position into a; running position the spring 5-5 ofthe valve structure 48 acts to cut off the flow of starting air to thepiston and cylinder structure 46 and such pres sure as is in thecylinder 46 bleeds therefrom back through the valve structure 48 toatmosphere permitting the piston to assumeit-s normal posi vingenergized by the operation of the ignition control switch G'Z'takesover and the valve Allis held open thereby so. that so long as the en,gine is running scavengin air will be delivered to the housing 23 forholding the valve 18 open in a degree corresponding to the pressure ofthe scavenging hi1,-

t n. At. thi time, the solenoid 3- he= lieve b r he, ventina or any s dul gas in ho.

ns. t nd: ther fuel: line it to at o h s F g res ofrtho rawinssshodition lo rot moans as oc a es w h he u lume rol valve o the en ne b h tdown.

y cu n on the. Sunn s f; t lol a thereto. by

ther means t an as operation o ho thro e leveror failure of,thescavenging air.

Gas hut-of ifs. o n idorodgto looh ost pracies me ns.- of stopping.asrar i i nition sasone gine, than is ignition interruption since enginestoppage cau ed by as shut-0. oav s th ns ne in anuraod' state. ith hese i the vent r bloed offi feature of the. iuo' g s vo um control; va vwho engine stoppag c used by ignit on in orrurtionlbavos th en in oomnloo 1y fl oded? withjfuel' gas The flood d c ndi on is extremel azar o s'snoc slo i r sidual arbon in o -r in s or r stmanifold may gnite thegasicau ne'an exp osion and a so m gh cause, undes able expire en uponthe restarting f ho n ine The? fuel volume. control alve s ructu e ithown in Insure 5. of he ir wmss s: ioo with his fuel; gas contr l valrot uc u just dosoribed, and. ts. peration contr lle by p sure ofscavengin air whic i de r to the housi 2?." through su table p n ng h hs connected th ough; a thre -W y" l cture TI to. the scaveng ng chamberof the n ne through medium of the r si g 5 A m 3! op r ted noodlevalve'ts; may e i e n w 7 The thIQE-W-ay valve structure 1 f shown inFigure 5 of the drawings is at Fulton 4 Sylr o' #530 1?; I; V spe iamperature presure operated; three-Way alve whic m y be purchased uponthe open market, and this valve may b pe ated th ough t med um f. thelever 14 a cylinder and piston structure identiar with that describedconnection with Fi oi he draw ngs and in th ame n However; v lve. l is sscept e by operation of various other pressure means and it has. a on"15 to the lubricating oil supengine at any suitablepoint, whereby the;be .ows t or P 'Q mocha nfism 16 for operating the valve H is subjectedto the pressure of the lubricating oil in the eng i'nes'oj that in theevent of failure of pressure of t o ubr oatine he moo m m is W111 beOlltatd to operate the valve H and cut on the flow of sca enging a r o thousing 3" thus cutting on; the'ilow of fuel gas to the engine andstopping its operation. A second type of con" trol of the valve H isprovided and this includes a thermal bulk; 71 which isplfaced at anysuitable r convenient po iti i t cooling wa r system ia lsot o the nginan i connected to the bellows 1 the usual m nner as h w at 181; sothattl e mechanism "E8 will be subject to poratiouo h thoruial u b i andh w, .uaothe temperature oi the jacket water roaches an exces ive or unesirable de ee the val e U will be Operated t out off the flow of thscavenging air to the tool gas v lum oontrol starred. or stars or the sgi e r the-- le hous r s h ou h: the n th a v 11 o d hoonr a valve Hthus permitting closing of the valve and the stoppage of the engine.

It will be understood that the invention is not to be limited to thespecific construction or arrangement of parts shown, but that they maybe Widely modified within the invention defined by the claims.

What is claimed is:

1. In a fuel gas volume control for internal combustion engines, thecombination with an internal combustion engine including a combustionchamber, scavenging air supply means, and a line for supplying fuel gasto said combustion chamber, of a fuel gas volume control valve connectedin the gas fuel supply line, means actuated by pressure of scavengingair for positively operating said fuel gas volume control valve, andmeans for bleeding off any residual fuel gas from the fuel gas supplyline between the volume control valve and the engine when said volumecontrol valve is closed.

2. In a fuel gas volume control for internal combustion engines, thecombination with an in-' ternal combustion engine including a combustionchamber, scavenging air supply means, and a line for supplying fuel gasto said combustion cham-- ber, of a fuel gas volume control valveconnected.

in the gas fuel supply line, means actuated by pressure of scavengingair for positively operating said fuel gas volume control valve, saidfuel gas volume control valve having a bleed-off opening therein open toatmosphere and to the fuel gas supply line between the volume controlvalve and said combustion chamber, means actuated upon operation of saidvolume control valve to close said bleed-off opening when the volumecontrol valve is open and to open the bleed-off opening when the volumecontrol valve is closed.

3. In a fuel gas volume control for internal combustion engines, thecombination with an internal combustion engine including a combustionchamber, scavenging air supply means, a governor controlled fuel gassupply valve, and a line for supplying fuel gas to said governorcontrolled valve, of a fuel gas volume control valve in the gas fuelsupply line, and means for operating said fuel volume control valve.

l. In a fuel gas volume control for internal combustion engines, thecombination with an internal combustion engine including a combustionchamber, scavenging air supply means, a governor controlled fuel gassupply valve, and a line for supplying fuel gas to said governorcontrolled valve, of a fuel gas volume control valve in the gas fuelsupply line, means for operating said fuel volume control valve, saidfuel gas Volume control valve having a bleed-off opening therein open toatmosphere and the fuel gas supply line between the volume control valveand said combustion chamber, means actuated upon opening of the volumecontrol valve to close said bleed-off opening, and means operable uponclosing of the volume control valve to open said bleed-off opening,

5. In a fuel gas volume control valve for internal combustion engines,the combination with an internal combustion engine including acombustion chamber, scavenging air supply means, a governor controlledfuel gas supply valve, and a line for supplying fuel gas through saidgovernor controlled valve to said combustion chamber, of a fuel gasvolume control valve connected in the gas fuel supply line, meansoperated by pressure of scavenging air for opening said fuel gas volumecontrol .valve to permit control passage of fuel gas to the combustionchamber, and a spring 8. for closing said volume control valve uponrelief of pressure of scavenging air to said pressure operated means.

6. In a fuel gas volume control for internal combustion engines, thecombination with an internal combustion engine including a combustionchamber, scavenging air supply means, a governor controlled fuel gassupply valve, and a line for supplying fuel gas to said governor controlvalve, of a fuel gas volume control valve in the gas fuel supply line,and means for operating said fuel volume control valve, said fuel gasvolume control valve having a bleed-off opening therein open toatmosphere and the fuel gas supply line between the volume control valveand said combustion chamber, means actuated upon opening of the volumecontrol valve to close said bleed-off opening, and means operable uponclosing of the volume control valve to open said bleed-off opening, saidfuel gas volume control valve having a bleedoif opening therein open toatmosphere and to the fuel gas supply line between the volume controlvalve and said combustion chamber, a valve member connected to thevolume control valve structure and operable therewith upon opening ofthe volume control valve to close said bleed-off opening' and to openthe bleed-off opening upon closure of the volume control valve.

7. In a fuel gas volume control for internal combustion engines, thecombination with an internal combustion engine including a combustionchamber, scavenging air supply means, and a line for supplying fuel gasto said combustion chamber, of a fuel gas volume control valve connectedin the gas fuel supply line, means operated by pressure of scavengingair for opening said volume control valve to permit control passage offuel gas to the combustion chamber, said engine including a manuallyoperated throttle handle, and means operated by said throttle handle tocontrol flow of scavenging air to said pressure operated means.

8. In a fuel gas volume control for internal combustion engines, thecombination with an internal combustion engine including a combustionchamber, scavenging air supply means, and a line for supplying fuel gasto said combustion chan ber, of a fuel gas volume control valveconnected in the gas fuel supply line, means operated by pressure ofscavenging air for opening said volume control valve to permit controlpassage of fuel gas to the combustion chamber, said engine including amanually operated throttle handle, means operated by said throttlehandle to control flow of scavenging air to said pressure operatedmeans, and a spring for closing said volume control valve upon relief ofpressure to said pressure operated means.

9. In a fuel gas volume control for internal combustion engines, thecombination with an internal combustion engine including a combustionchamber, scavenging air supply means, and a line for supplying fuel gasto said combustion chamber, of a fuel gas volume control valve connectedin the gas fuel supply line, said gas fuel control valve comprising thevalve seat, a tapered valve for cooperation with said valve seat, meansfor opening said volume control valve in increments to control thevolume of fuel gas deliveredv through the volume control valve, saidmeans for opening said volume control valve comprising a diaphragm, afluid tight housing enclosing said diaphragm, means for deliveringscavenging air from the scavenging air supply means to said housing foraction on said diaphragm, and means independently of said diaphragm forgestures figcioin'g said tapered-verve; said fuel gas volume control,valve havinga bleed-ofl opening there'- in open to atmosphere 'and'thefuel' gas supply linebetween the a volume control valve and saidlcoinbustionf chamber, mean's'factuated upon opening movement "of saidtapered valve for closing said bleed-oi? opening and for openingthebleed-ouopen'ing upon closing of said tapered valve, 1 q

10." In a fuel gas volume control for internal combustion enginealthecombinationvwith an internal combustion'engine' including a, combusetionchamber, scavenging air supply'means, andi a line'for.supplymglfuel' gas to said combustion chamber, of, afuelgafs-volumecontrol valve connected. in the gas fuel sup ly line, said gasfuelcontrol valve comprising a valve seat, a tapered valvefor cooperationwith said, valve seat, and means: for opening said volumev control valvein incrementsto control thevolumeof fuelgasdelivered through the volumecontrol valve, said means for openingsaidvolume control valvecem prisinga diaphragm, a fluid tight housing enclosing: said; diaphragm) means fordelivering scavenging" air: from scavenging air supply means to saidhousing for action on said diaphragm? and means: independently ofdiaphragm for'closing; said-tapered valve, said fuel gas volume controlvalve having a bleed-off opening. therein open to atmosphere and thefuel gas supply llnebetwe'en'the' volumecontrol valvet'anid saidcombustion chamber, means actuated upon opening movement of said taperedvalve for closing said bleed-off opening and for opening the bleed-01fopening upon closing of said tapered valve, said engine including amanually operable throttle handle, and means operated by said throttlehandle to control flow of scavenging air to said pressure operatedmeans.

11. In a fuel gas volume control for internal combustion engines, thecombination with an internal combustion engine including a combustionchamber, scavenging air supply means, and a line for supplying fuel gasto said combustion chamber, of a fuel gas volume control valve connectedin the gas fuel supply line, means actuated by pressure of scavengingair for positively operating said fuel gas volume control valve, andmeans acted upon by pressure of lubricating oil in the engine forclosing said volume control valve when the pressure of lubricating oilfalls below a predetermined pressure.

12. In a fuel gas volume control for internal combustion engines, thecombination with an internal combustion engine including a combustionchamber, scavenging air supply means, and a line for supplying fuel gasto said combustion chamber, of a fuel gas volume control valve connectedin the gas fuel supply line, means actuated by pressure of scavengingair for positively operating said fuel gas volume control valve, andmeans acted upon by temperature of cooling water in the engine forclosing said volume control valve when the temperature of the coolingwater rises above a predetermined degree.

13. In a fuel gas volume control for internal combustion engines, thecombination with an internal combustion engine including a combustionchamber, scavenging air supply means, and a line for supplying fuel gasto said combustion chamber, of a fuel gas volume control valve connectedin the gas fuel supply line, and means actuated by pressure ofscavenging air for positively operating said fuel gas volume controlvalve, and means for and the combu 10 bleeding ofiany residual fuelgas'rrom the ma gas supply-line between the volume-control valve V p upnchamber when said volume control valve is' closed. I V L 14. In a fuelgas volume controlfor internal conr1bu'sti onf v engines; thecombination'wi h an in ternal combustion engine including a; combustionchamber','scavenging air supplymeans, a governor controlled fuelgas's'upply valve, a use for supply-'- m fuel gas to said governor"controlled vane, or a fuel as volume control valve, in the g as fl'ielsupply line, means; for o erating said fuel volume control valve, andmeans for bleeding us any residual fuel gasrrum the fuel gas supplunstetween the volume control valve and the combustion. chamber whensaid volume control valve is closed.

151m a fuelgasvolu'me control for internal combustion engines, thecombination with an i n-ternal combustion engine including a combustionchamber, scavenging air supply means, a governor controlled fuel gassupply valve, and a} line forsupplying ffuel' gas through said governorcontrolledvalve to said-combustion chamber, of

afue'l' gas volume.control.valve connected in the gas fuel supply line,means operated by pressure of. scavengingair for opening said' fuelgasvolulne control valve to permit control passage of fuel gas to,the-combustion chamber a springfor. cl'o's ingi said" volume controlvalve upon relief of" pres sure ofv scavenging air to said pressureoperated means, an cllmea'ns fort bleeding off any residual fuel gasfrom the fuel gas supply line between the volume control valve and thecombustion chamber when said volume control valve is closed.

16. In a fuel gas volume control for internal combustion engines, thecombination with an internal combustion engine including a combustionchamber, scavenging air supply means, a governor controlled fuel gassupply valve, a line for supplying fuel gas to said governor controlledvalve, of a fuel gas volume control valve in the gas fuel supply line,and means actuated by pressure of scavenging air for positivelyoperating said fuel gas volume control valve.

1'7. In a fuel gas volume control for internal combustion engines, thecombination with an internal combustion engine including a combustionchamber, a scavenging air supply means, a governor controlled fuel gassupply valve, a line for supplying fuel gas to said governor controlledvalve, of a fuel gas volume control valve in the gas fuel supply line,and means actuated by pressure of scavenging air for positivelyoperating said fuel gas volume control valve, and means acted upon bypressure of lubricating oil in the engine for closing said volumecontrol valve when the pressure of lubricating oil falls below apredetermined pressure.

18. In a fuel gas volume control for internal combustion engines, thecombination with an internal combustion engine including a combustionchamber, scavenging air supply means, a governor controlled fuel gassupply valve, a line for supplying fuel gas to said governor controlledvalve, of a fuel gas volume control valve in the gas fuel supply line,means actuated by pressure of scavenging air for positively operatingsaid fuel gas volume control valve, and means for bleeding off anyresidual fuel gas from the fuel gas supply line between the volumecontrol valve and the engine when said volume control valve is closed.

19. In a fuel gas volume control for internal combustion engines, thecombination with an internal combustion engine including a combustionchamber, scavenging air supply means, a governor controlled fuel gassupply valve, alinefor supplying fuelgas to said governor controlledvalve, of a fuel gas volume controlvalve in the gas fuel supply line,means actuated by pressure of scavenging air for positively operatingsaid fuel gas volume control valve, means for bleeding oil any residualfuel gas from the fuel gas supply line between the volume control valveand the engine when said volume control valve is closed,

gas fuel supply line, means actuated by pressure of scavenging air forpositively operating said fuel gas volume control valve, means forbleeding off any residual fuel gas from the fuel gas supply line betweenthe volume control valve and the engine when said volume control valveis closed, means acted upon by temperature of cooling water in theengine for closing said volume control valve when the temperature of thecooling water rises above a predetermined degree, and means acted uponby pressure of lubricating oil in the engine for closing said volumecontrol valve when the pressure of lubricating oil falls below apredetermined pressure. p

21. In a fuel gas volumecontrol for internal combustion engines, thecombination with an internal combustion engine including a combustionchamber, scavenging air supply means, and a line for supplying fuel gasto said combustion chamber, of a fuel gas volume control valve connectedin the gas fuel supply line, means actuated by pressure of scavengingair for positively operating said fuel gas volume control valve, saidfuel gas volume control valve having a bleed-off opening therein open toatmosphere and to the fuel gas supply line between the volume controlvalve and said combustion chamber, means actuated upon operation of saidvolume control valve to close said bleed-off opening when the volumecontrol valve is open and to open the bleed-01f opening when the volumecontrol valve is closed, and means acted upon by pressure of lubricatingoil in the engine for closing said volume control valve when thepressure of lubricating oil falls below a predetermined pressure.

CLARENCE S. KENWORTHY. WILLIAM J. BLESSING.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,910,279 Buchi May 23, 1933 2,375,071 Boyer May 1, 1945

